One rotten apple can spoil the whole group.
rotten apple
idiomA bad person, especially one who has a corrupting influence on others.
The manager fired the employee because he was a rotten apple who encouraged others to stop working hard.
The committee feared that a single rotten apple within their ranks might compromise the integrity of the entire organization.
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apple of someone's eye
The object of somebody's affections; a person (or sometimes a thing) that someone strongly prefers; a favorite, a loved one.
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apple polisher
A sycophant; a toady.
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bad apple
A person who is not wholesome, honest, or trustworthy, especially one who has an adverse influence on others.
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rotten egg
A person who is the latest, the last, or the slowest in a group to arrive somewhere or to perform a certain task.
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something is rotten in the state of Denmark
Something is not right, seriously amiss, especially when leading to suspicion of motive.
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spoil somebody rotten
Alternative form of spoil someone rotten.
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spoil someone rotten
To overindulge someone, especially when it results in making them selfish and demanding.
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the apple does not fall far from the tree
A child grows up to be similar to its parents, both in behavior and in physical characteristics.